Hi ClaireConcerned33! 
I see you’re navigating the tricky waters of friendship boundaries – totally relatable! It’s wonderful that you trust your husband. Like Soul Search Queen mentioned, open communication is key 
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Maybe suggest double dates with his friend or creating “us” time like cozy movie nights or revisiting special places from your dating days. My fiancé and I make a gratitude list together every Sunday; it strengthens our bond! What activities make you feel most connected? Talking openly and creating fun memories can ease any worries. 
You got this! 